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Full text of "Handbook Of Chemical Engineering - I"

32
CHEMICAL ENGINEERING
and hand fires, Fig. 21 (from B. & W. 1913 issue of "Steam'7) gives the usual draft required for various coals. Artificial draft is generally necessary for steam sizes of anthracite. The following table applies to plants where oil fuel is used.
5           10           15           20            25           30           35           40
Pounds of Goal Burned per Square Foot of Grate Surface per Hour
FIG. 21.—Draft for various coals. STACK SIZES FOR OIL FUEL
Stack	Height in feet above boiler-room floor						
diameter							
							
inches	50	70	90	100	120	140	160
18	57	88	103	108	115	120	124
24	110	173	204	214	229	240	249
30	182	288	342	361	388	409	424
36	272	436	521	550	596	629	655
42	382	615	741	785	852	902	940
48	512	830	1,000	1,060	1,160	1,230	1,290
54	660	1,080	1,310	1,390	1,520	1,610	1,700
60	827	1,360	1,660	1,760	1,940	2,060	2,160
66	1,020	1,670	2,050	2,180	2,400	2,560	2,690
72	1,220	2,020	2,490	2,650	2,910	3,130	3,290
84	1,690	2,830	3,490	3,730	4,130	4,430	4,670
96	2,250	3,770	4,670	5,000	5,560	5,980	6,320
108	2,880	4,840	6,030	6,470	7,180	7,770	8,230
120	3,580	6,060	7,560	8,130	9,060	9,800	10,400
Figures represent nominal rated horsepower; table based on centrally located stacks, short direct flues and ordinary operating efficiencies. (Courtesy C. C. Moore & Co., Engrs., and C. R. Weymouth, San Francisco.)
The cheapest and least durable chimney is the guyed steel stack. Self-supporting metal stacks and those of reinforced concrete come next. Radial and hollow brick stacks, properly designed, are cheaper than those of common brick of equal excellence.